ARMY TM 9-6115-670-14&P 4-121 4.48.  GOVERNOR CONTROL ASSEMBLY. This task covers: a. Test b. Replace INITIAL SETUP Tools Shop Equipment, Electrical Repair, Semitrailer Mounted (Item 3, Appendix B) Equipment Conditions MASTER ON-OFF switch on APU control unit   set to off. Materials/Parts Multimeter Governor Control Assembly Air filter removed (para 4.45.). TEST a.  Remove top cover (18, Figure 4-36). b.  Tag and remove electrical leads P7 (7, Figure 4-19) from J7 (6). c.  Attach multimeter leads to pins A and B of P7 (7). d.  Start APU (para 2.5.).  Check for voltage. e.  After engine speed has stabilized, move control arm on governor to vary engine speed.  Multi-meter should read between 24 and 28 VDC.  If multimeter does not read between 24 and 28 VDC, governor control is faulty.  Shut down APU (para 2.6.) and replace governor control assembly. REPLACE WARNINGS Ensure that APU DC power supply is disconnected. Ensure that the APU is turned off and completely de- energized before opening generator housing. Failure to observe these warnings could result in severe injury or DEATH to personnel. WARNING DC voltages are present at generator set components even with generator set shutdown.  Avoid grounding self when touching any electrical components.  Failure to observe this warning can result in personal injury or DEATH by electrocution. NOTE In order to avoid a low fuel fault shutdown of the APU, testing time shall not exceed three minutes maximum.